Railway-draft-rigging friction-gear.



G. A JOHNSON. vRAILWAY DRAFT BIGGING FRICTION GEAR.

' 1 'APPLIcAlTmN FILED 1AN,.`2.191T. l lmgmn Pamed Apr. 29, 1919.

IN VEN TOR.

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Specification of :Letters Patent.

.appncann ala January a, ieri. semi no. Monia.

To .all @07mm it may concern.'

Be' it known that l, GEORGE A. JOHNSON, a citizen-of the United States,residing at Chicagq, in the county of Cook and State of lllinois, haveinvented a certain new and useful lmproveinent in 'Railway-Draft-RiggingFriction-Gears, of which the following is a full, clear, concise, andexact description,

reference being had to the accompanying drawings, forming a part of thisspecification. f

trailway draft rigging friction gears.

rllhe obj ect of the invention is to piovide a friction gear suitable"for railway draft specification, Figure 1 is a. part elevation,

p'art. longitudinal section of a draft rigging `showing my-improveii'ients in connection illustrating 'the position of the partsunderv retaining bolt 20. Coperablel with the fric-l therewith, theparts being illustrated in normal or. full release position. Fig. 2 isview similar to Fig. 1 of the gear proper and full compression. Fig. 3is a' verticahtransverse sectional view of the .friction gear andtakenon the line 3-3 of` Fig. 1. Figs. Il 'and 5 aire detail perspectives ofthe wedge and one'of the friction shoes, respectively.

l And Figli isa broken View in section similar to Fig.'1, butillustrating another em` bodiment of' the invention.

Referring irstto the construction' illustrated in Figs. 1 to 5inclusive, 10 denotes a center sill having rear 'stop 11 and'front stop12sejcured thereto. The draw bar 13 is operatively connected withthe"gear by` means of a yoke 14: and the parts supported construction. y

The improved friction gear, as shown,

comprises a preferably 'cylindrical castingl A having an 'integralfriction shell proper 16, spring casing 17, and rear wall 18, the

latter having'an inwardly extended hollow boss 19 to accommodate therear end of the tion shell 1G is a'cifrcularly arranged series offriction shoes- 21, each of thelatter having a wedge face 22 on itsinterior with which cooperatesa wedge 23. As clearly shown rllhisinvention relates to improvements in in Fig. 1, the friction shoes are.extended outwardly4 beyond the end of the4 friction shell and the wedgein turn is extended beyond the ends of the friction shoes, the wedgeengaging the front follower' 24. '.The rear end of the casting A,engages the rear follower 25. rlhe wedge 23, which is provided with thesame numiber of wedge faces as the number of friction shoes,- has ahollov7 rarwardextension 26, the latter at its rear end being providedwith a. wide flange 27 saidflange b'eing suitably reinforced by webs28-`. 28. The retaining bolt 2O extendsV thro-ugh ,said hollow extensionand the nuton the bolt is received within the hollow wedge 23. rl`hefriction shoes 21 bear at their sired'amOunt, apredetermined frictioncan be obtained between the friction shoes and I the 'friction shell,which friction ivill remain substantially constant during the ent-ireacl tion of the gear. The wedge, shoes land spring 30 will operate as aunit which may 'be termed a friction piston in' its relation with thefriction shell.` lIt will furthermore be noted that this friction isobtained at the 'very beginning ofthe compression stroke and is alwaysmaintained-in-nor'mal position of the parts and during the compressingaction. At the rear of said flange 27 is disposed a heavy springcomprising an outer,

' heavy coil 31 vand an inner lighter coil 32.

Upon bufling movement, pressure from the diraw bar will be transmittedfromV the wedge 23 and from the latter through the friction shoes-to theshelland on account of the relation of the friction shoes, wedge andlspring 30, the degree of friction will remain constant during theentire inward movement. of said elements as a unit. In addition to thefrictional resistance thus obtaiiied,there is the added straight springresistance of the heavy springs 31 and 82. ln Fig. is illus'- stratedthe position of the parts under full compression. When the pressure isremoved, the parts will be released by the heavy rea-tentes spass, isis.i

spring acting1 through the Wedge to disengage the latter froin its tightfrictional oontact with the shoes, should the la-t-ter stick at hrst.rlhis disengaging inovenientef the Wedge relatively to the shoes isperinissible on account of the remaining permissible compression of thelight spring'BO. 'lhe Wedging elements being thus released by the heavyspring Will all be returned to full fre'- lease or norinal position andthe gear then in condition to receive another blow.

ln the construction illustrated in llig. t3, the arrangement issubstantially the saine as that. illustrated in the 'otherligures exceptthat the wedge 123 is provided with a short rearward extension 126 thatis .soelreted Within a boss 50 formed on the forward side of a follower127. ln other Words, instead of forining the iiange at the rear of theWedge integral with the latter, as illustrated in Figs; l, 2 and et, theflange or follower is made separable in order to Vfacilitate asseniblingof the parts.- The operation Will bev the saine as for that abovedescribed, it being' understood that `the capacity of the springsl atthe rear ol the follower l2? will be Great enouefh to overcoine thelin'ht s'irinxr b Le; o l :i

interposed between the said follower and the friction shoes and alwaysniaintainl the Wedge and said follower l2? in tight engagement with each.-otlier.,

l. lin a friction gear, the combination with a friction shell, offriction shoes eooperable therewith., a Wedge eo-actiiig with 'saidshoes, ineans for maintaining' a predetermined and substantiallyconstant degree of friction between said shoes and shell,

' and a release spring.

2. ln a friction gear, the combination with a friction shell, oflrietioii shoes,

Wedge, and spring assembled to in ove as unit and with a substantiallylined nonvarying Wedge relation between the shoes, Wedge and spring;d'urinn" actuation of the gear; and a sprii j ac'I ng to resistnieveinentof said unit ane to effect the release action. i

3. ln a ict-ien gear, the coinbination with a friction shell, offriction shoes, wedge, and spring' assembled to inove as a unit and witha substantiallyr lined relation relatively to said shell duringlactuation of the gear, and a spring; acting` to resist saidlnovenientand to effect the release action, said last nained spring1exerting' pressure directly against said Wedge.

l. ln a friction gear, the combination .with a friction shell, of aseries of friction .-iiisin, the combination ivith a friction sl i of afriction piston coperable with of' the piston shoes coperable 7with saidshell, a Wedge VAinner end, a light spring extending between said flangeand the friction shoes and -reacting` against both, and a heavy spring14,within the casing' engaging' the casing at one end and said' tlange atthe other end.

G. ln a friction gear, the combination with a friction shell, of aplurality of friction shoes eoperable with said shell, ai Wedgecoactingl with said shoes and having;F an integral inward eatension'with a flangel ati` its inner end, a relatively light spring;norin'ally alinost fully compressed, extend ing between said flange andsaid slices, and

a heavy release spring,l engaging; said 'l'. ln a friction shoclrabsorbinginechaf shell, said piston comprising outer i'ri shoes engagingthe' shell, shoe-eiipand-inn ineans, and a spring" reacting against sineans and shoes to inaiiitain a reir-itiT lined relation therebetween;and a ina springfor resisting,1 ielatife nioveinent be tiveen saidpiston and she-ll, the resistance of the inaiii spring' and Ifrictionalresistance and shell being; einployed additively. i

8. ln friction slioelr absorbing.,` mecha-- nisin, the combination witha eoinbined frio tion shell and' springv easing; of ineans inevablerelatively to said shell and coact A therewith to produce asubstantially iini forni frictional resistance duringl the entirecompressive inoveine. t; and a spring; Wit said easing acting in tandemwithv s L0. ln a friction shoelr absorbinog' niecha- 'iti lll@

iiisin, the combination ivith a substantially constant frictionalresistance and a spring,r resistance arranged to act in tandem, saidspring' resistance being' arranged to effect release of the frictionresistance. Y

ln witness that claini the here hereunto subscribed iny naine t day ofDec.

